Prompt Title: Arduino Reaction Time Training

Sure, here's an altered version of the project that uses a 3x3 configuration of push buttons:

Materials:

• Arduino Uno board
• Breadboard
• 9 LEDs
• 9 push buttons
• 18 jumper wires

Instructions:

1. Connect the 9 LEDs to pins 2-10 of the Arduino board.
2. Connect each push button to pins A0-A2 and 11-13 of the Arduino board. Each button should be connected between its respective pin and the ground pin (GND) on the breadboard.
3. Connect the breadboard to the Arduino board.
4. Connect a jumper wire from each LED to the breadboard.
5. Connect a jumper wire from each button to the breadboard.

Now that the hardware is set up, here's how the project works:

1. The athlete will be presented with a 3x3 grid of LEDs and push buttons.
2. The LEDs will randomly light up one at a time.
3. The athlete's reaction time is measured by the time it takes them to press the correct button after the corresponding LED lights up.
4. The Arduino board will measure the time it takes for the athlete to press the correct button and display the reaction time on the serial monitor.

To program the Arduino board, you can use the following code:

scssCopy code
const int buttonPins[] = {A0, A1, A2, 11, 12, 13};  // the pins that the push buttons are attached to
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10};  // the pins that the LEDs are attached to
const int numButtons = 6;   // the number of push buttons
int ledIndex;               // index of the currently lit LED
int buttonIndex;            // index of the correct push button
long startTime;             // time when the LED turns on
long reactionTime;          // time between LED turning on and button being pressed

void setup() {
  for (int i = 0; i < 9; i++) {
    pinMode(ledPins[i], OUTPUT);      // set the LED pins as output
    digitalWrite(ledPins[i], LOW);    // turn off all LEDs
  }
  for (int i = 0; i < numButtons; i++) {
    pinMode(buttonPins[i], INPUT);    // set the button pins as input
  }
  Serial.begin(9600);                 // initialize serial communication
}

void loop() {
  ledIndex = random(9);       // choose a random LED to light up
  buttonIndex = ledIndex;     // the correct button index is the same as the LED index

  digitalWrite(ledPins[ledIndex], HIGH);   // turn on the LED
  startTime = millis();                    // save the time the LED turned on

  while (true) {
    for (int i = 0; i < numButtons; i++) {
      if (digitalRead(buttonPins[i]) == HIGH && i == buttonIndex) {
        // if the correct button was pressed
        reactionTime = millis() - startTime;    // calculate the reaction time
        Serial.print("Reaction time: ");
        Serial.println(reactionTime);    // display the reaction time on the serial monitor
        digitalWrite(ledPins[ledIndex], LOW);  // turn off the LED
        delay(1000);                  // pause for 1 second before starting the next round
        break;                        // exit the for loop
      }
    }
    if (digitalRead(buttonPins[button